Mr Lambert infiltrated the Animal Liberation Front and his evidence
helped convict two men of fire-bombing three Debenhams stores.

In an interview with the Guardian, Mr Lambert denied planting the device.

The attack in Harrow, north west London, did �340,000 of damage and was
part of a series of attacks on stores, including attacks in Romford and
Luton, which cost �8m and caused Debenhams to stop selling furs.

The BBC has sought to give Mr Lambert a right of reply, and is awaiting
his response.